Control method, device and system of refrigerating system

The embodiment of the invention discloses a control method, device and system of a refrigerating system. The refrigerating system comprises a first refrigerating subsystem and a second refrigerating subsystem, the first refrigerating subsystem comprises a heat bypass, the heat bypass is provided with a heat bypass electronic expansion valve, and the control method comprises the steps that the actual temperature, the target temperature, the running state and the running requirement of a target chamber are obtained; according to the operation state and the operation requirement, the working state of the heat bypass is controlled; and according to the actual temperature and the target temperature, the opening degree of a thermal bypass electronic expansion valve arranged on a thermal bypass is adjusted. According to the control method, device and system of the refrigerating system, the temperature returning problem of the compartment can be solved, and the control reliability is improved. 本发明实施例公开了一种制冷系统的控制方法、装置